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2020 or 3030

Builder

Don't know if this is the correct place to ask this but this seemed the correct place.

I am going to build a 100W laser cutter with a build area at around 600x1200mm. i want to build the frame out aluminium extrusions. 2020 extrusion is about half the price of 3030 in my area. But i don't know if 2020 is strong enough for most of the frame the longest piece would be about 1500 or 1600 mm. I would make the gantry frame out of 2060. Would this be stiff enough? or would 3030 be better.